In the preceding papers I have, with some repetition and much stumbling, set out a fairly complete theory of what men and women have to do at the present time if human life is to go on hopefully to any great happiness and achievement in the days to come. Much of this material was first prepared to be delivered to a lecture audience, and I regret that ill-health has prevented a complete re-writing of these portions. There is more of the uplifted forefinger and the reiterated point than I should have allowed myself in an essay. But this is a loss of grace rather than of clearness. And since I am stating a case and not offering the reader anything professing to be a literary work, I shall not apologise for finally summing up and underlining the chief points of this book. They are, firstly: that a great change in human conditions has been brought about during the past century, and secondly that a vast task of adaptation, which must be, initially and fundamentally, _mental_ adaptation, has to be undertaken by our race. It is a task which politicians, who live from day to day, and statesmen, who live from event to event, may hinder or aid very greatly, but which they cannot be expected to conduct or control. Politicians and statesmen perforce live and work in the scheme of ideas they find about them; the conditions of their activities are made for them. They can be compelled by the weight of public opinion to help it, but the driving force for this great task must come not from official sources but from the steadfast educational pressure of a great and growing multitude of convinced people. In times of fluctuation and dissolving landmarks, the importance of the teacher--using the word in its widest sense--rises with the progressive dissolution of the established order. The creative responsibility for the world to-day passes steadily into the hands of writers and school teachers, students of social and economic science, professors and poets, editors and journalists, publishers and newspaper proprietors, preachers, every sort of propagandist and every sort of disinterested person who can give time and energy to the reconstruction of the social idea. Human life will continue to be more and more dangerously chaotic until a world social idea crystallizes out. That--and no existing institution and no current issue--is the primary concern of the present age.